Head Scratcher - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hotrod1952 · 10-10-2016, 08:55 PM

95 c1500 170K miles. Just bought it as a project. Was told it used some oil...
Drove it for about a month. When oil on full line 1 qt to 100 miles or so. Ran perfect. Developed EGR code. Upon inspection EGR passages in the intake plugged. Removed valve covers and intake. Found many years of varnish. So bad it plugged all the oil return holes in the heads. Thinking "that was easy". Installed the intake turned engine over to TDC #1 dropped distributor in. Hooked everything up - started - ran bad (did not have it timed - did not know about timing bypass wire) for like 45 secs to 1 minute and died. Can not get to start. rechecked timing - verify spark - had none. Pulled distributor again installed a rebuilt one.(after inspection bushings were loose) Rebuilt came with new ignition module and pick-up coil. Got spark - only it's jumping around. Found out about timing wire by glove box. Disconnected it. Timing light flashes at 0 degrees now. Back fire in the throttle body. pull valve cover verify pushrods are down valves up. yep. Checked fuel pressure. 13-14PSI. Put new pressure regulator diaphram in Throttle body. Rechecked still 13psi. Timing light flashes at tdc. Spark plug tester shows spark. So far I have replaced Coolant temp sender by t-stat, unplugged knock sensor(got code43 now), new egr, checked TPS tested good.(Ordered one anyway). Installed another map sensor (used). Plugs will be in tommorow. What gives? What am I missing? Wires look good. It ran on them before fine.

sntrym95 · 10-10-2016, 09:33 PM

Does it rev up ok? If it does, check the Idle Air Control valve.

I'd also be suspicious of the new dizzy; depending on the brand they can be crappy, especially the ignition module. Always put heatsink compound (I use Arctic Silver) on the new module.

Make sure the plug wires are in the correct order (I know, I know, but I've mixed them up a few times too).

Check the spray pattern on the TBI. Does it look ok?

Just a few thoughts...

Hotrod1952 · 10-11-2016, 09:15 PM

Plugs did not show up. Columbus day. Had too much yard work etc. Will get back to it Weds night. I'll definately recheck wires.

Fuel spray alternates back and forth now.

10-10-2016, 09:33 PM	#2
sntrym95 Registered User Join Date: Jan 2006 Location: Big Pine Key, FL Posts: 758	Re: Head Scratcher Does it rev up ok? If it does, check the Idle Air Control valve. I'd also be suspicious of the new dizzy; depending on the brand they can be crappy, especially the ignition module. Always put heatsink compound (I use Arctic Silver) on the new module. Make sure the plug wires are in the correct order (I know, I know, but I've mixed them up a few times too). Check the spray pattern on the TBI. Does it look ok? Just a few thoughts... __________________ Mike

10-11-2016, 09:15 PM	#3
Hotrod1952 Registered User Join Date: Sep 2013 Location: Sioux Center IA Posts: 185	Re: Head Scratcher Plugs did not show up. Columbus day. Had too much yard work etc. Will get back to it Weds night. I'll definately recheck wires. Fuel spray alternates back and forth now.

10-10-2016, 08:55 PM	#1
Hotrod1952 Registered User Join Date: Sep 2013 Location: Sioux Center IA Posts: 185	Head Scratcher 95 c1500 170K miles. Just bought it as a project. Was told it used some oil... Drove it for about a month. When oil on full line 1 qt to 100 miles or so. Ran perfect. Developed EGR code. Upon inspection EGR passages in the intake plugged. Removed valve covers and intake. Found many years of varnish. So bad it plugged all the oil return holes in the heads. Thinking "that was easy". Installed the intake turned engine over to TDC #1 dropped distributor in. Hooked everything up - started - ran bad (did not have it timed - did not know about timing bypass wire) for like 45 secs to 1 minute and died. Can not get to start. rechecked timing - verify spark - had none. Pulled distributor again installed a rebuilt one.(after inspection bushings were loose) Rebuilt came with new ignition module and pick-up coil. Got spark - only it's jumping around. Found out about timing wire by glove box. Disconnected it. Timing light flashes at 0 degrees now. Back fire in the throttle body. pull valve cover verify pushrods are down valves up. yep. Checked fuel pressure. 13-14PSI. Put new pressure regulator diaphram in Throttle body. Rechecked still 13psi. Timing light flashes at tdc. Spark plug tester shows spark. So far I have replaced Coolant temp sender by t-stat, unplugged knock sensor(got code43 now), new egr, checked TPS tested good.(Ordered one anyway). Installed another map sensor (used). Plugs will be in tommorow. What gives? What am I missing? Wires look good. It ran on them before fine.



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